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IGNITION TIMING

Figure 1

here are plenty of things that can go wrong with a traditional
automotive ignition system, and perhaps chief among them the
actual ignition timing.
The timing of when the distributor releases the charge from the
ignition coil to the spark plug varies across the range of engine
revolutions. The total timing of the distributor, reported in degrees, is
comprised of that provided by the initial timing, the centrifugal advance
mechanism and the vacuum advance unit.

Distributor or crankshaft degrees

When reading timing specifications it is critical that the type of
degrees reported in the specifications consulted is determined.
Distributors turn at one-half the speed of the crankshaft. Therefore,